Django models django:SQL联合或与queryset连接：与annotate一起使用时工作不正常

我有下面两个查询集books1和books2。在这两个方面，我使用annotate添加另一列，books1的常量为10，books2的常量为30。问题是在连接查询集之后，最终的集合显示注释值=10，即使对于books2也是如此

author1 = Author.objects.get(pk=1)

books1 = author1.books_set.annotate(sample_var=Value(10))

author2 = Author.objects.get(pk=2)

books2 = author2.books_set.annotate(sample_var=Value(30))

combine = books1 | books2

我看到：

name                  author id       sample_var
name1 (from books1)       1                10
..                        1                10
..                        1                10
..                        1                10
name2 (from books2)       2                10 (instead of 30) 
..                        2                10 (instead of 30) 
..                        2                10 (instead of 30) 
..                        2                10 (instead of 30) 

原因是，用于联合收割机的sql如下所示。我在尝试访问组合[0]时收到此消息。名称。它负责WHERE部分，但不负责注释部分。它使用10作为组合查询集的“sample_var”，这是不对的，这就是为什么上表中都显示10的原因

SELECT "books_books"."name", "books_books"."author_id", 10 AS "sample_var"
FROM "books_books" 
WHERE ("books_books"."author_id" = 1 OR "books_books"."author_id" = 2)

我认为，如果要正确地进行联合，sql应该：

SELECT "books_books"."name", "books_books"."author_id", 10 AS "sample_var"
FROM "books_books" 
WHERE ("books_books"."author_id" = 1)
union all
SELECT "books_books"."name", "books_books"."author_id", 30 AS "sample_var"
FROM "books_books" 
WHERE ("books_books"."author_id" = 2)

在Django 1.11中，您可以执行以下操作：

all_books = books1.union(books2, all=True)